Field winding for electric machines



March 30,1926. 1,578,916

L. M. PERKINS FIELD WINDING FOR ELECTRIC MACHINES Origin a1 FiledApri} 15, 1922 "m ML W Patented Mar. 30, 1926. v

UNITED STATES 1,578,916 PATENT OFFICE.

LAURENCE M. PERKINS, OF EAST PITTSBURGH, PENNSYLVANIA, ASSIGNOR OF ONE- HALF TO OWEN DYNETO CORPORATION, OF SYRACUSE, NEW YORK, A CORPORA- TION OF NEW YORK.

FIELD WINDING FOR Original application filed April 13, 1922, Serial No. 552,311. Divided and this application filed March 24,

ELECTRIC MACHINES.

1925. Serial No. 18,006.

To ail wlzom it may concern:

Be it known that I, LAURENCE M. PERKlNS, a citizen of the United States, and a resident of East Pittsburgh, Allegheny County, Pennsylvania, have invented an Improvement in Field lVindings for Electric Ma-- chines, of which the following is a specification.

This invention relates to field windings for electric machines, particularly of the motor, generator or motor generator type, and has particular reference to a process or method of and apparatus for producing such field windings. This is a division of my 00- pending application on, field windings filed April 13, 1922, Serial NOL-552,311.

An object of the invention is the production of an electrical machine of the multipolar type in which a continuous conductor passes through each of ,the inter-polar spaces substantially axially in such a way as to give the poles alternately north and south polarity.

Another object of the invention is the production of a field winding for a multi-polar machine in a single operation.

Another object is the elimination of soldered joints in the field winding. A further object is the production of all the field windings for a multi-polar machine from a continuous conductor.

Other objects and advantages relate to the details of construction and form of the field winding, and the process used in producing the same, all aswill more fully appear from the following description taken in connection with the accompanying drawings, in which:

Figure 1 is an end elevation of a field winding of my invention.

Figure 2 is a side elevation of the same.

Figure 3 illustrates an apparatus used in manufacturing the winding of my invention.

Figure 4 is a side elevation of the same apparatus, illustrating the method of rolling the interfitting layers of the conductor together to form the completed winding.

The drawings illustrate a field windingfor a six pole machine, but my invention includes a winding for any multi-polar machine and by multi-polar, I mean any machine having more than two poles.

portions. The side walls of the U-shaped recesses may preferably be substantially parallel, and extend substantially parallel with the axis of the winding when considered upon the inner circumference of the completed field winding, so that the U-shaped recesses are capable of receiving a pole piece having substantially parallel sides and as each of the U-shaped recesses iseopen at one end,,the field winding does not encircle any po'le'piece.

The field winding of this invention is built up on a continuous conductor- 1 whichmay be formed of a single strip of copper wire, ribbon or strap, or for-flexibility purposes the continuous conductor may be formed of a double, triple, or other plural strap constituting in effect a single, continuous conductor which should be suitably insulated and wound as illustrated, to produce alaterally circular structure formed of a plurality of longitudinally U-shaped laterally curved pole pieces receiving windings 2, each separate pole piece winding consisting of a plurality of overlying or telescoped U shaped thicknesses of said ribbon, wire or strap.

Each side of any one of the U-shaped sec-- tionsconstitutes a side of the adjacent U- shaped section, said overlying parallel extending layers of said strap winding back and forth through the inter-polar spaces and extending partially around three sides only of each pole piece.

Figures 3 and 4: disclose, primarily, the preferred method of manufacturing the field winding, and from these figures it can be seen that a support or base 3 is provided, which carries a series of shaping pins, the relative arrangement, number and size of said pins dependent on the size of the field winding and the number of pole receiving U-shaped spaces to be formed.

The illustration discloses a board equipped with pins suitable for forming the six pole field winding disclosed,

to V

Various sizes of pins are needed to form the exterior, interior and intermediate layers of the continuous conductor as formed in the completed windin The pins are arranged in two rows 1 and 5 staggered with respect to each other, and each row comprises a plurality of series of pins, the corresponding pins of each series being the same size, and each series of pins differing in size from the pins of the other series of the same row. One row of pins is arranged in a series of decreasing size from end to end, and the other row in a series of increasing size from end to end from the same end toward the other end, so that the smallest pins oi? one row are arranged in staggered relation with respect to the largest pins in the other row.

vEach row preferably contains the same number of series and the same number of pins in eachseries the size being such as to form the intermitting layers of the continuous conductor, as illustrated.

Specifically the row at comprises two large pins 6, three somewhat smaller pins 7, three still smaller pins 8, three still smaller pins 9 the three pins 10 smaller than the pins 9. The row 5 comprises the same series of pins and the same size pins in each series beginning at the opposite end of the row with two large pins 11 corresponding to the pins (3, three smaller pins 12 corresponding to the pins 7, three still smaller pins 18 corresponding to the pins 8, and three still smaller pins 14 corresponding to the pins 9, and three still smaller pins 15 corresponding to the pins 10. When the conductor 1 has been wound back and forth around these pins as illustrated, first around one of the small pins 15 and then around one of the pins 6, and

the continuous conductor has been formed into the oppositely opening loop shaped structure illustrated in Figure 3 starting at one end as the left hand end of the drawing, the loop formed around the first pin 15 is by rolling the strap into laterally circular form, rolled into the loop formed around the first pin 14 and by continuing the rolling process the loop formed around the first pin 6 forms a layer outside of the layer or loop formed around the second pin 7, and so forth, until the entire continuous couductor is rolled into the form shown in Figure 2, the ends of the conductor constituting the terminals or leads 16 and 17. This 'm-ethod of producing the field winding consisting in forming the strap, ribbon or Wire into loops of proper size and in proper relation, and then rolling the loops of one size into the loops of the next size or about the loops of the next size so as to form the layers of the completed winding, is efficient and comparatively simple, and inex ensive in the production of a novel and hig 11y efficient field winding. i

It is believed that this invention will be fully apparent to those skilled in the art to which it appertains but I desire it understood, that various changes in the form, proportions and method maybe made, such as fall within the scope of the appended claims without departing from the spirit of the invention.

What I claim as new and desire to secure by Letters Patent of the United States is:

'1. The method of manufacturing a field Winding for a multi-polar electrical machine comprising forming a conductor into a series of loops and rolling the looped conductor to telescope certain of the loops.

2. The method of manufacturing a field Winding for a multi-polar electrical machine comprising forming a conductor longitudinally into a seriesof oppositely opening loops and rolling said looped conductor to telescope certain of the loops.

3. The method of manufacturing a field winding for a multi-polar electrical machine comprising forming a conductor into a series of oppositely opening loops and rolling the loopedconductor into laterally substantially circular form to thereby telescope certain loops within other loops.

t. The method of manufacturing a field Winding for a multi-polar electrical machine comprising forming a conductor into a series of oppositely opening loops and rolling the conductor longitudinally so as to be substantially circular in lateral cross section, and thereby placing loops opening in one direc tion into or outside of loops of different size opening in the same direction, and placing loops opening in the opposite direction into or outside of loops of different size and opening in the sameedirection.

In testimony whereof, I have signed my name to this specification this 20th day of March, 1925.

LAURENCE M. PERKINS. 

